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SCHEDULE III REAL ESTATE AND RELATED DEPRECIATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Activity in Storage facilities |  |  |
Balance at beginning of year | $ 5,489,754 | $ 4,699,844 | $ 4,463,455
Acquisitions & improvements | 1,795,965 | 825,247 | 364,324
Fully depreciated assets | (52,722) | (83,418) | (81,717)
Dispositions and other | (19,408) | (8,533) | (3,033)
Construction in progress, net | (30,095) | 14,718 | (43,185)
Right-of-use assets - finance leases |  | 41,896 |
Balance at end of year | 7,183,494 | 5,489,754 | 4,699,844
Activity in Accumulated depreciation |  |  |
Balance at beginning of year | 983,940 | 925,359 | 862,487
Depreciation expense | 160,933 | 143,952 | 145,233
Fully depreciated assets | (52,722) | (83,418) | (81,717)
Dispositions and other | (6,327) | (1,953) | (644)
Balance at end of year | 1,085,824 | 983,940 | 925,359
Storage properties, net | 6,097,670 | $ 4,505,814 | $ 3,774,485
Aggregate cost of real estate investments for federal income tax purposes | $ 7,452,800 |  |

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- Definition Represents the amount that was removed from accumulated depreciation pertaining to real estate that was sold during the period. Also includes other decreases or increases in accumulated depreciation for the period. + References No definition available. + Details
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- Definition Represents the amount of real estate investments acquired and improvements made during the period. + References No definition available. + Details
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- Definition Represents the carrying amount of real estate sold during the period. Also includes other decrease (increase) in the carrying amount of real estate investments during the period. + References No definition available. + Details
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- Definition Represents the amount of fully depreciated assets of real estate for the period. + References No definition available. + Details
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- Definition Represents the gross amount of construction in progress of real estate during the period. + References No definition available. + Details
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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column F)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of depreciation expense of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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